// Copyright (c) 2020 Tigera, Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package proxy_test

import (
	"net"

	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"
	v1 "k8s.io/api/core/v1"
	discoveryv1 "k8s.io/api/discovery/v1"
	"k8s.io/client-go/kubernetes/fake"
	"k8s.io/utils/ptr"

	"github.com/projectcalico/calico/felix/bpf/bpfmap"
	"github.com/projectcalico/calico/felix/bpf/conntrack"
	"github.com/projectcalico/calico/felix/bpf/mock"
	proxy "github.com/projectcalico/calico/felix/bpf/proxy"
)

var _ = Describe("BPF kube-proxy", func() {
	initIP := net.IPv4(1, 1, 1, 1)

	maps := new(bpfmap.IPMaps)
	maps.FrontendMap = newMockNATMap()
	maps.BackendMap = newMockNATBackendMap()
	maps.AffinityMap = newMockAffinityMap()
	maps.MaglevMap = newMockMaglevMap()
	maps.CtMap = mock.NewMockMap(conntrack.MapParams)
	front := maps.FrontendMap.(*mockNATMap)

	var p *proxy.KubeProxy

	healthCheckNodePort := 1212

	BeforeEach(func() {
		testSvc := &v1.Service{
			TypeMeta:   typeMetaV1("Service"),
			ObjectMeta: objectMetaV1("testService"),
			Spec: v1.ServiceSpec{
				ClusterIP: "10.1.0.1",
				Type:      v1.ServiceTypeLoadBalancer,
				Selector: map[string]string{
					"app": "test",
				},
				ExternalTrafficPolicy: v1.ServiceExternalTrafficPolicyTypeLocal,
				HealthCheckNodePort:   int32(healthCheckNodePort),
				Ports: []v1.ServicePort{
					{
						Protocol: v1.ProtocolTCP,
						Port:     1234,
						NodePort: 666,
					},
				},
			},
		}

		testSvcEps := &discoveryv1.EndpointSlice{
			TypeMeta:    typeMetaV1("EndpointSlice"),
			ObjectMeta:  objectMetaV1("testService"),
			AddressType: discoveryv1.AddressTypeIPv4,
			Endpoints: []discoveryv1.Endpoint{
				{
					Addresses: []string{"10.1.2.1"},
				},
			},
			Ports: []discoveryv1.EndpointPort{
				{
					Port:     ptr.To(int32(1234)),
					Name:     ptr.To("http"),
					Protocol: ptr.To(v1.ProtocolTCP),
				},
			},
		}

		k8s := fake.NewClientset(testSvc, testSvcEps)
		p, _ = proxy.StartKubeProxy(k8s, "test-node", maps, proxy.WithImmediateSync(), proxy.WithMaglevLUTSize(maglevLUTSize))
	})

	AfterEach(func() {
		p.Stop()
	})

	It("should update nodeports after host ip changes", func() {
		By("checking nodeport has the initial IP", func() {
			p.OnHostIPsUpdate([]net.IP{initIP})
			Eventually(func() bool {
				front.Lock()
				defer front.Unlock()

				for k := range front.m {
					if k.Addr().String() == initIP.String() {
						return true
					}
				}
				return false
			}).Should(BeTrue())
		})

		updatedIP := net.IPv4(2, 2, 2, 2)

		By("checking nodeport has the updated IP and not the initial IP", func() {
			p.OnHostIPsUpdate([]net.IP{updatedIP})

			Eventually(func() bool {
				front.Lock()
				defer front.Unlock()

				for k := range front.m {
					if k.Addr().String() == initIP.String() {
						return false
					}
					if k.Addr().String() == updatedIP.String() {
						return true
					}
				}
				return false
			}).Should(BeTrue())
		})

		By("checking nodeport has 2 updated IPs", func() {
			ip1 := net.IPv4(3, 3, 3, 3)
			ip2 := net.IPv4(4, 4, 4, 4)
			p.OnHostIPsUpdate([]net.IP{ip1, ip2})

			Eventually(func() bool {
				front.Lock()
				defer front.Unlock()

				ip1ok := false
				ip2ok := false

				for k := range front.m {
					if k.Addr().String() == ip1.String() {
						ip1ok = true
					} else if k.Addr().String() == ip2.String() {
						ip2ok = true
					}
				}
				return ip1ok && ip2ok
			}).Should(BeTrue())
		})
	})
})
